In the dehumanized world of the future, people live in underground cities run by computer, are force-fed drugs to keep them passive, and no longer have names--just letter/number combinations (Duvall is THX 1138). Emotion is also outlawed and when the computer-matched couple THX 1138 and LUH 3417 discover love, they must battle the computer system to escape. George Lucas' first film, which was inspired by a student film he did at USC.